Preparation

Beat butter and sugars in large bowl with electric mixer at medium speed until light and fluffy. Add eggs, one at a time, beating well after each addition. Add melted chocolate, sour cream and vanilla; beat until blended. Add flour mixture alternately with espresso, beating well after each addition. Pour batter evenly into prepared pans.

Prepare Creamy Chocolate Frosting and White Chocolate Curls, if desired. To fill and frost cake, place one layer on cake plate; frost top with Creamy Chocolate Frosting. Place second layer over frosting. Frost top and side with frosting; smooth frosting. Place White Chocolate Curls on cake, if desired.